Plain files
Real `.md` files you can keep in any repo, folder, or agent workflow.
Free native Markdown editor
Aviv Editor
A calm native Markdown editor with writing and preview in one clean surface.
Built natively for macOS and Windows, Aviv avoids browser-shell overhead so Markdown feels fast, light, and quiet: around 80 MB RAM in normal document work, with CPU returning to 0% when idle or backgrounded.
Fast native app
~80 MB working RAM
0% idle CPU
No license key
MIT open source
LightAbout 80 MB RAM in document work.
CalmOne surface, no preview pane.
PlainReal `.md` files on disk.
Markdown without the split-screen tax.
Aviv keeps one editable surface: readable like a document, honest like plain text, and quiet enough for daily work.
Live surface
Rendered Markdown stays inline while the source remains editable.
Quiet chrome
Minimal controls, no dashboard, no mode switcher, no clutter.
Native speed
Native desktop builds instead of a browser shell around a web app, so Aviv can stay open without taxing battery or memory.
Lower overhead
Focused native code keeps the app light for everyday notes and specs, with idle CPU dropping back to 0%.
Open source
MIT licensed, public on GitHub, free without a paid unlock.
Write in one place.
The document stays readable while you edit, so writing does not become a preview-management task.
Keep the structure intact.
Markdown remains plain, portable, and agent-readable underneath the calm visual layer.
Use local images naturally.
Attachments render inline while Aviv preserves the original Markdown source path.
The language of agents
Markdown is the calm format agents already understand.
Prompts, specs, decisions, and agent instructions need a format that reads well for people and parses cleanly for machines. Markdown is that common ground.
Agent prompts and system instructions
Implementation plans and acceptance criteria
Evidence-first reports and decision logs
Reusable business knowledge in Git
Portable documentation for humans and models
Native means fast, calm, and light.
Aviv uses Swift and AppKit on macOS and WinUI 3 on Windows so the editor can stay native without carrying a browser shell, memory-heavy runtime, or idle CPU drain.
Native windows
macOS document behavior with tabs and multiple windows.
Quiet minimap
A small map follows the real rendered viewport.
Native print
Print and page setup use the macOS system flow.
Battery quiet
About 80 MB RAM in normal document work and 0% CPU when idle or backgrounded.
A4 print mode
Blog and A4 formats keep writing calm while printing uses paper-aware margins.
Default app prompt
Native startup prompts can help make Aviv the app that opens Markdown files.
Download
Free, native, no key.
Aviv is a free native download for macOS and Windows. No lite mode, no license key, no subscription prompt, no hidden unlock, and no heavy browser-shell footprint.